Drill bit



www, 11923. m4775932 S. F. BASHARA ET AL.

DRILL BIT Filed Feb. 16. 1920 2 SheeS-Shee?, l

ATTORNEYS' Patented Dee. ll, lit-923..

'entre sTaTs innen' PATENT earners.;

SAMUEL F. BASHLRA AND JOSEPH E. BASHARA, 0F HUSTON, TEXAS.

DRILL- BIT.

V Application led February 1G, 1920. Serial- No. 359,131.

.' To all whom it may concer/a:

'Be it known that'we, SAMUEL F. BASHARA and JOSEPH F. BASIYIARA` citizens of the United Statesand Mount Lebanon, Syria,

, respectively, residing at Houston, in the Vzo county of Harris and State of Texas, have L invented certain new-and usefulj :l[mprovements in a Drill Bit, of which-the following is a specification. l y This invention relates to' newv anduseful improvements in a drill bit.

One object of the invention is to provide a drill bit of the sh tail type, which is adapted to be attached to the lower end of a drill stem to be used in rotary drilling. The fish tail bit now in common use' is formed of relatively thin material and has thin cutting blades which soon become worn off, and dulled, or broken and must be withdrawn and sharpenedV and then again attaehed to the drilll stem and let down into the bore to resume operations. In sharpening to the bi ing the bit, it is often not properly tempered so that the blades readily break and the shank. the most expensive part of the bit, must be thrown away. At the same time, much valuable time is wasted in withdrawing the stem and removing and replacing` i vide a drill bit of the type described having a plurality of water courses therethrough, through which water is forced, with great pressure, to the tip of the bit which keeps the bit from becoming too hot and at the same time washes away the gumbo and other cuttings and prevents the same from stick- A still further feature-of the invention is to provide a drill bit which is attached directly to the stem through the medium of a heavy drill collar, said bit being formed with cutting blades which will penetrate the formation at an even and uniform rate and which will therefore subject the stem to an even and uniform strain, thus eliminating the liability of the stem becoming twisted in two and the hole lost.

A still further feature of the invention resides in thev provision of a sample taking' device to be used in connection with the bit herein described.

With the above and other objects in view, the invention has particular relation to certain novel features of construction, operation and arrangement of parts, an example of which is given in the specification and illustrated in the accompanying drawings wherein- Figure 1 is a side elevation of the bit, Figure 2 is a vertical `sectional view thereof,

Figure 3 is a perspective view, Figure 4 shows a transverse sectional view taken'on the line 4, t of Figure 2,

Figure 45 is a side elevation of the bit,

showing the sample taking device in con-` nection therewith,

Figure 6 is a vertical thereof,

Figure 7 shows an enlarged side elevation of a pilot bit employed, Y

Figure 8 shows a bottom plan view of said pilot bit, and

sectional view Figure 9 is a transverse cross section'- through the bit. F'

Referring now more vparticularly to the drawings, wherein like numerals of reference designate similar parts in each 0f the figures. the numeral l refers to the bit, w ich is formed of relatively thick material, preferably tool'steel. The lower end of this bit has the oppositely curved blades or tips 2 which are formed with sharp cutting edges 3. On account of the sturdy design of these blades, 'the edges'will remain sharp for a much longer period of time than is the case with the fish tail bits now in common use, and they will .consequently penetrate the various formations encountered readily,- thus subjecting the stem to a uniform and even strain and thereby reducing the' liability of said stem becoming twisted 0H, and' as they remain sharp for a much longer period of time than is the case with ordinary fish tail bit the stem does not have to be often withdrawn for the sharpening of the bit or'thesubstitution of a new one, and much time is thus saved in the process of drilling.

The bit has an outwardly threaded neck 1iwhich is screwed directly into a heavy drill collar 5 into which the lower end of the drill stem 6 is also threaded. The lower end of the drill holler abats directly against the upper smooth face of the bit, thus adding to the strength thereof. In the type shown in Figures 1 to 4:, inclusive, the bit has a central fluid conduit 7 which separated into the branches 8, 8 through which water is dis- 18 will be seated and the core will be held in charged from the drill stem to the cutting edges 3 and on opposite sides of said central conduit 7 there are the side conduits 9, 9 through which water is discharged from the stern to the sides of the bit.v These water conduits are provided to supply a sufficient quantity of water to the bit to keep the same cool and at the same time to disintegrate and carry away all the cuttings and and prevent said bit from becoming clogged other formation from the point of the bit therewith.

In forms shown -in Figures 5 to 9, inclusive there is a pilot bit 1() formed of a reduced outwardly threaded neck 11 and oppositely disposed, fan shaped, abrading members 12. This pilot bit is threaded into a centrally located socket in the bit 1 and has a central bore 13 to permit the passage of a core therethrough, and also has water courses through ywhich water is delivered to the abrading surfaces. The bit 1,'in this form, also has a central bore 14, which is aligned with the bore 13, the bore through the bit being provided to receive the lower end of the liner 15, whose lower end rests upon, but it not attached to the-upper end of the neck 11 of the pilot bit. This liner is formed of two longitudinal sections whichv are hinged together at one side. by means of the hinges 16 and the liner is formed'ofrelatively thin material. This liner projects up into the drill stemas far as desired and it is surrounded and protected by means of a pipe section, whose lower end is screwed intothe upper en'd of thleJ bit 1 and 'whose upper end is provided with a valve 18 which excludes all Water and prevents .the same from becoming mingled with the core or sample in said liner,vbut which permits the escape of air as the core enters the liner.'

`During the process of drilling the pilot bit 10 cuts around the core, thus leaving a perfect core which passes up into the liner 15, the valve 18 meanwhile opening to permit the escape of air. y

v When it is desired to examine' the sample -taken the stem is withdrawn and broken up in the usual way and when the upper end of the pipe section 17 is reached, the valve 18 may be removed and the liner 15 then lifted out and' opened, thus leaving thesample in perfect condition unmiXed with water or other foreign matter.

As the stem is being withdrawn the valve the liner by suction.

WhatI We claim is: f

l. .The combination withk a drill bit having a central bore, and whse upper end is formed into a reduced threaded neck and whose lower end has oppositely curved blades, of a pilot drill attached to the lower end of said bit and having a central bore which aligns with the bo-re of the bit and a tubular liner `extending' through said bores and whoselower end rests upon the upper tubular liner, formed of sections which are hinged together, "said liner extending .through said bores.

3. The combination with a drill bit having a central bore, and whose upper end is formed into a reduced threaded neck and whose lower end has oppositely curved blades, of a pilot drill attached to the lower end of said bit and having a central bore which aligns with the bore of the bit, a liner `extending through said bores and adapted to receive a core, and a tubular section surrounding the liner and whose lower end is anchored to the drill bit.

4. The combination with a drill bit having a central bore, of a core forming device carried by the lower end of said bit and having a central bore which aligns with the bore of the bit, a liner forming a core barrel within the bore of the drill bit and a tubular section surrounding said core barrel and anchored to the bit. f

In testimony whereof we have signed our names to'this specification in the presence of two subscribing witnesses.

- F. BASHARA.

WM. A.' CATHEY, A. ALLEN. 

